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The Emergency Flashers are controlled by signals from the Body Control Module not a 1980s round flasher unit.
you need a mobile auto electrician with a pro grade scan tool computer to see where the issue is. They with look for Diagnostic Trouble 'P' Codes and also Diagnostic 'U' Codes.
1. Do your emergency flashers work?
Check all your fuses, make sure they are getting a good contact.
If your emergency flashers work, it may be a faulty turn signal switch.
If your emergency flashers work that will eliminate the flasher. The one flasher works both turn and emergency signals.
The Combination Flasher, also refered to as the combo-flasher, is mounted to the in-line bracket which is located to the right of the Junction Block.
The Junction Block (JB) is located in the left endcap of the instrument panel.
REMOVAL
Open hood and disconnect the negative battery cable remote terminal from the remote battery post.
Remove the left instrument panel silencer. Refer to Body Instrument Panel Silencer, REMOVAL.
The flasher can be removed by pulling in a rearward direction.
INSTALLATION
Install the flasher by firmly pushing it into place.
Install the left instrument panel silencer. Refer to Instrument Panel Silencer, INSTALLATION.
Connect the negative battery cable remote terminal to the remote battery post.
Figure out where your fuse block is by reading your manual. There will be two flasher units plugged into it which are identical. One is for emergency flashers and the other signals. If you swap them, and then the signals work but not the emergency flashers, you have just figured out your problem. The manual is in the glove box, if it is not there then buy a used one on ebay for a couple bucks or call a dealer.
check fuse under dash, or may be a bad flasher. you'll find that right next to fuse box you should have 2 flashers one for turn signals @ 1 for emergency flashers
It is not in but under the steering column, when you hit your flashers or 4 ways listen for a clicking sound on driver side, it will lead you to you turn signal relay switch.
Check the flasher unit, switch the emergency flasher with signal flasher see if emergency will work. Possibly they run off same "double flasher", probably replace it.
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